[DML] Re: PRV Fuel Enrichment

["Harold McElraft" <hmcelraft@xxxxxxx>]

On the DeLorean K-Jetronic, there is a by-pass valve in the throttle 
plates that overcome the lean condition created by deceleration. 
No.6.

Harold McElraft - 3354


--- In dmcnews@xxxxxxxxxxxxxxx, Martin Gutkowski <webmaster@xxxx> 
wrote:
> Well, what enrichment systems are there (I'm intrigued by Jim's 
total of 
> six, so let's add 'em up)
> 
> 1) Warm up enrichment - the most basic function of the control 
pressure 
> regulator
> 2) Cold start valve - extra shot of fuel when the engine's below a 
> certain temperature, controlled by the thermotime switch on the 
top of 
> the water pump.
> 3) Accelleration enrichment - vacuum fed to the CPR via delay 
valve 
> lowers control pressure when vacuum is "lost", but only for a few 
> seconds, and only when the engine's cold
> 4) Lambda system enrichment - firstly during warm up, which is not 
> strictly enrichment because it's just waiting for the exhaust 
sensor to 
> get hot enough. However, this state in a hot engine results in 
rich 
> running which is why this is used for...
> 5) Full throttle enrichment - effectively puts the lambda ecu into 
> "warm-up" mode.
> 6) Errm. Not sure.
> 
> The B28E UK spec equivalent of the DeLorean engine did not have a 
cat or 
> lambda system, so removing both and replacing with equivalent 
components 
> yields pretty healthy power and torque gains. The CPR has constant 
> accelleration enrichment, but to a lesser degree than the B28F. 
The 
> ignition timing and fuelling curves differ and in the compromise 
of 
> power, ecomony and emissions, where DeLorean leaned more towards 
economy 
> and emissions, the B28E leans towards power.
> 
> Martin
> 
> content22207 wrote:
> 
> > Actually the PRV runs quite well with absolutely no fuel 
enrichment
> > whatsoever. I know because that's how I took possession of my own
> > copy. Had fuel metering of course, but no enrichment beyond that.
> > 
> > I am now running one enrichment mechanism only -- through the 
CPR (038
> > series, much simpler than 066). 
> > 
> > Martin Gutkowski has also jetisoned most of his Lambda based
> > enrichment mechanisms with good results.
> >




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